do people get duds o2's ??? I put this one in less than 3 months ago ....

 

Only if you buy Bosch. Tried them in several GM vehicles, never worked. Of course there are other factors that can effect their performance as well. Exhaust leak for example. Wire splicing can do it also. Some folks don't understand that O2 gets into the sensor through the wire openings.

 

Well I got Bosch 02 sensors and they are doing just fine. It could just be that you got a bad set, or other possible reasons could be that your vehicle is running rich and fouled up the sensor or even a contamination problem.

 

I got the gm ones , I used to get a bank 1 heater circuit code to before I replaced both of the front o2's , no codes till now..... I might swap in my old one from the right bank. I have come to find out my miss/rich problem was the opti and not the o2's so my guess is my old ones are still pretty good. I do hope I dont have a wiring harness problem.

I did notice that after driving for like 20 mins or so (rare I live 3 miles from work) the o2 seems to start acting normal for the most part...